Plant setter keeps in dilapidated toilets (9)
I believe the answer is:
mistletoe
'plant' is the definition.
The answer is an example.
'setter keeps in dilapidated toilets' is the wordplay.
'setter' becomes 'me' (the setter of the clue).
'keeps in' indicates putting letters inside.
'dilapidated' is an anagram indicator.
'toilets' is an anagram of 'istleto'.
'me' placed around 'istleto' is 'MISTLETOE'.
(Other definitions for mistletoe that I've seen before include "People kiss under this plant" , "Evergreen plant" , "Plant with white berries, facilitates kissing" , "Something to stand under when kissing?" , "Parasitic plant" .)